:root {
  color-scheme: light dark;
  --text: #1a1a1a;
  --muted: #555;
  --bg: #fafafa;
  --card: #fff;
  --link: #0b57d0;
  --border: #e5e5e5;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #f2f2f2;
    --muted: #b0b0b0;
    --bg: #121212;
    --card: #1c1c1c;
    --link: #8ab4f8;
    --border: #333;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

h1 {
  font-size: 1.75rem;
  margin: 0 0 0.25rem;
}

h2 {
  font-size: 1.15rem;
  margin-top: 2rem;
}

.meta, .muted {
  color: var(--muted);
  font-size: 0.95rem;
}

a { color: var(--link); }

ul { padding-left: 1.25rem; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin-top: 1.5rem;
}

.card a {
  display: block;
  margin: 0.5rem 0;
  font-weight: 600;
  text-decoration: none;
}

.card a:hover { text-decoration: underline; }

nav {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.95rem;
}